Science

1.Suppose 10 atoms of carbon (C) react with 20 atoms of oxygen (O). According to the Law of Conservation of Matter, how many atoms will there be in the product of this reaction?(1 point)
A. 20
B. 30***
C. 10
D. 15

2.Which procedure could be used to demonstrate that matter is conserved during a chemical change or reaction?(1 point)
A. Find the mass of a stick of butter. Heat the butter until it melts. Find the mass of the melted butter.
B. Find the mass of a piece of paper. Tear the paper into smaller pieces. Find the mass of the pieces.***
C. Find the mass of an acid and a base. Combine them to produce water and a salt. Find the mass of the water and salt.
D. Find the mass of a log. Burn the log until it turns to ash. Find the mass of the ash.

3.What is always true according to the Law of Conservation of Matter?(1 point)
A. The total number of molecules before and after a chemical reaction stays the same.
B. Atoms created during a chemical reaction must have the same mass as the atoms in the reactants.***
C. Atoms can be rearranged during a chemical reaction but cannot be added or taken away.
D. New molecules cannot be formed from the reactants during a chemical reaction.

4.A student combines two liquids in a beaker. She observes that the mass of the combined liquid is less than the mass of the two separate liquids. The student claims that this observation shows that matter is not conserved in chemical reactions. Which statement explains why the student’s claim is incorrect?(1 point)
A. The combined liquid was warmer than the two separate liquids.***
B. The product contained fewer atoms than the reactants.
C. The reaction produced a gas that escaped the beaker.
D. The reaction did not change the physical properties of the liquids.
HELP ASAP!!!!! PLEASE AND THANK YOU

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  1. Helppppp!!!!!!! Asap

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  2. ONLY THE FIRST ONES RIGHT

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  3. lol- do you have the rest of the answers?

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  4. 1)D
    2)B
    3)A
    4)B

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  5. ANon is wrong

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  6. first one is 30

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  7. plz post aswers not the number/letter they mix it up

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  8. helppppppppppppppppppppppppppp

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  9. 1. 30
    2. find the mass of an acid and a base
    3. atoms can be rearranged during a chemical reaction but cannot be added or taken away
    4. the reaction produces a gas that escaped the beaker

    i got a 100

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  10. cool is right

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  11. I used cools answers and got a 100%

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  12. thanks cool

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  13. Thx @Cool, I got 100% with your answers

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  14. Thx @cool!

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  15. cool is right

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  16. here my user name is my Xbox add me it is also my Fortnite and cod modern warfare and cool is right

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  17. cool is right

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  18. cool do be right tho

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  19. Cool right

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  20. Cool.......THANK YOU SOO MUCH MY MOM SAID SHE'S PROUD OF ME FOR THE FIRST TIME THANK YOU THANK YOU

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  21. thanks cool ur amazing

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  22. @Rainbow Thats yet to happen to me 😔

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  23. ONLY THE FIRST ONE WAS RIGHT...........

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  24. cool is correct!! thank youu <33

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  25. your amazing

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  26. Kk @yooooooooooo im on my way to friendship town!!!

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  27. And tysm @cool!!

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  28. hello, for connexus students the answer would be
    D
    B
    A
    D

    @COOL would be right if you are a normal students.
    best of luck to you all

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  29. thats different sis

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  30. u gotta put the answer not the letters

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  31. Thanks Cool!!! 100% and my grade keeps going up!

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  32. It's nice to come back a year later and see how appreciated i am!

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  33. hIGH

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  34. the sad thing is, some day if this website doesn't shut down, we could be in our 20's and kids are still using our answers, sad to think how time goes by so quick

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  35. YO DONT LISTEN TO HI HOMIES, ITS ACTUALLY
    1. A
    2. B
    3. D
    4. A

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  36. For the CA is wrong

    1. 30
    2. find the mass of a log. Burn the log until it turns to ash and smoke. Find the mass of the ash.
    3. Zn + 2HCl → H2 + ZnCl2
    4. The total number of atoms does not change, so mass is conserved in the reaction.

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  37. its actually "Find the mass of an acid and a base. Combine them to produce water and a salt. Find the mass of the water and salt." but ok

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  38. 1000000 PERCENT RIGHT FOR CA THANK UUU

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  39. Nebula, our kids are gonna see these petty arguments and be weirded out.

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  40. ty cool 100%

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  41. 1. 30
    2. Find the mass or on acid and a base coming in hem to produce water…
    Man I don’t usually do these but I give up these answers are right tho don’t listen to your mom I got a 50

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  42. 1) 30
    2)Find the mass of an acid and a base. Combine them to produce water and a salt. Find the mass of the water and salt.
    3)Zn + 2HCl → H2 + ZnCl2
    4)The total number of atoms does not change, so mass is conserved in the reaction.

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  43. 1. 30
    2. Find the mass of an acid and a base. Combine them to produce water and salt. Find the mass of water and salt.
    3. Zn+2HCL= H2 + ZnCl2
    4. The total numbers of atoms does not change, so mass is conserved in the reaction.

    I took the test and got 100%! All of these answers are correct!!!!

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  44. Thank you @NEW ANSWERS 100% right!!!!!

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  45. I need help On a USA Test Prep LLC
    It has 25 questions and is science

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  46. i need help on the unite 3 lesson 11 in sience 7th grade

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  47. Am i the only one who got
    30
    Find the mass of an acid.....
    Atoms can be recharged....
    the reaction produced the gas....

    as the correct answers? Hope that helps for people who got my questions and i promise its 100% if they are the answers on your quick checks

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  48. So you do not have to scroll back up here are the 100% answers.

    1. 30
    2. find the mass of an acid and a base
    3. atoms can be rearranged during a chemical reaction but cannot be added or taken away
    4. the reaction produces a gas that escaped the beaker

    i got a 100

    cool
    Oct 8, 2020

    Use these answers he has 223 👍🏻 and 4 👎🏻. There is a 00.0000000000000000000000000000001% chance you will get it wrong using these answers. Creds to "cool".

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  49. 1. 30
    2. find the mass of an acid and a base
    3. atoms can be rearranged during a chemical reaction but cannot be added or taken away
    4. the reaction produces a gas that escaped the beaker
    Trust me I got 100% good luck lovely’s ✌️

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  50. @cool is right tysm

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  51. Thanks COOL your the best

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  52. @Rainbow congrats! :) and thx cool you are correct!

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  53. Idk why I said thx I didn’t even take the quiz lol

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  54. guys cool is correct, use their answer NOW

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  55. 1. 30
    2. Find the mass of an acid and a base. Combine them to produce water and a salt. Find the mass of the water and salt.
    3. Atoms can be rearranged during a chemical reaction but cannot be added or taken away.
    4. The reaction produced a gas that escaped the beaker.

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  56. Guys @Cool is 100% Right! I got a 100% on my quick check Also I was Sneezing NON STOP and I thought to myself " Am I allergic to School?"
    @Cool is right so yeah! Thanks Cool U DA BEST

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  57. thanks cool your the best!!!!!!!!!!!!!!!!!!!!!!!

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  58. Cool is correct, I got 100% read the answers on the test, and in his/her post, and make sure they match, and thou shall pass

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  59. tnx you guys so much

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  60. cool is cool

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